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<FONT color="green">001</FONT>    // Copyright 2007 Waterken Inc. under the terms of the MIT X license<a name="line.1"></a>
<FONT color="green">002</FONT>    // found at http://www.opensource.org/licenses/mit-license.html<a name="line.2"></a>
<FONT color="green">003</FONT>    package org.ref_send.list;<a name="line.3"></a>
<FONT color="green">004</FONT>    <a name="line.4"></a>
<FONT color="green">005</FONT>    import static org.ref_send.promise.Eventual.near;<a name="line.5"></a>
<FONT color="green">006</FONT>    import static org.ref_send.promise.Eventual.ref;<a name="line.6"></a>
<FONT color="green">007</FONT>    <a name="line.7"></a>
<FONT color="green">008</FONT>    import java.io.Serializable;<a name="line.8"></a>
<FONT color="green">009</FONT>    import java.util.Iterator;<a name="line.9"></a>
<FONT color="green">010</FONT>    import java.util.NoSuchElementException;<a name="line.10"></a>
<FONT color="green">011</FONT>    <a name="line.11"></a>
<FONT color="green">012</FONT>    import org.joe_e.Equatable;<a name="line.12"></a>
<FONT color="green">013</FONT>    import org.joe_e.Struct;<a name="line.13"></a>
<FONT color="green">014</FONT>    import org.ref_send.promise.Promise;<a name="line.14"></a>
<FONT color="green">015</FONT>    import org.ref_send.promise.Receiver;<a name="line.15"></a>
<FONT color="green">016</FONT>    <a name="line.16"></a>
<FONT color="green">017</FONT>    /**<a name="line.17"></a>
<FONT color="green">018</FONT>     * A linked list.<a name="line.18"></a>
<FONT color="green">019</FONT>     * @param &lt;T&gt; element type<a name="line.19"></a>
<FONT color="green">020</FONT>     */<a name="line.20"></a>
<FONT color="green">021</FONT>    public final class<a name="line.21"></a>
<FONT color="green">022</FONT>    List&lt;T&gt; implements Iterable&lt;T&gt;, Serializable {<a name="line.22"></a>
<FONT color="green">023</FONT>        static private final long serialVersionUID = 1L;<a name="line.23"></a>
<FONT color="green">024</FONT>    <a name="line.24"></a>
<FONT color="green">025</FONT>        static protected final class<a name="line.25"></a>
<FONT color="green">026</FONT>        Link&lt;T&gt; implements Equatable, Serializable {<a name="line.26"></a>
<FONT color="green">027</FONT>            static private final long serialVersionUID = 1L;<a name="line.27"></a>
<FONT color="green">028</FONT>    <a name="line.28"></a>
<FONT color="green">029</FONT>            protected Promise&lt;Link&lt;T&gt;&gt; next;<a name="line.29"></a>
<FONT color="green">030</FONT>            protected T value;<a name="line.30"></a>
<FONT color="green">031</FONT>        }<a name="line.31"></a>
<FONT color="green">032</FONT>    <a name="line.32"></a>
<FONT color="green">033</FONT>        /**<a name="line.33"></a>
<FONT color="green">034</FONT>         * first element link<a name="line.34"></a>
<FONT color="green">035</FONT>         */<a name="line.35"></a>
<FONT color="green">036</FONT>        protected Promise&lt;Link&lt;T&gt;&gt; first;<a name="line.36"></a>
<FONT color="green">037</FONT>    <a name="line.37"></a>
<FONT color="green">038</FONT>        /**<a name="line.38"></a>
<FONT color="green">039</FONT>         * first unused link<a name="line.39"></a>
<FONT color="green">040</FONT>         */<a name="line.40"></a>
<FONT color="green">041</FONT>        protected Link&lt;T&gt; last;<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>        /**<a name="line.43"></a>
<FONT color="green">044</FONT>         * link count<a name="line.44"></a>
<FONT color="green">045</FONT>         */<a name="line.45"></a>
<FONT color="green">046</FONT>        private long capacity;<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>        /**<a name="line.48"></a>
<FONT color="green">049</FONT>         * element count<a name="line.49"></a>
<FONT color="green">050</FONT>         */<a name="line.50"></a>
<FONT color="green">051</FONT>        private long size;<a name="line.51"></a>
<FONT color="green">052</FONT>    <a name="line.52"></a>
<FONT color="green">053</FONT>        private<a name="line.53"></a>
<FONT color="green">054</FONT>        List() {<a name="line.54"></a>
<FONT color="green">055</FONT>            last = new Link&lt;T&gt;();<a name="line.55"></a>
<FONT color="green">056</FONT>            last.next = ref(last);<a name="line.56"></a>
<FONT color="green">057</FONT>            first = last.next;<a name="line.57"></a>
<FONT color="green">058</FONT>            capacity = 1;<a name="line.58"></a>
<FONT color="green">059</FONT>            size = 0;<a name="line.59"></a>
<FONT color="green">060</FONT>        }<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>        /**<a name="line.62"></a>
<FONT color="green">063</FONT>         * Constructs a list.<a name="line.63"></a>
<FONT color="green">064</FONT>         * @param &lt;T&gt; element type<a name="line.64"></a>
<FONT color="green">065</FONT>         */<a name="line.65"></a>
<FONT color="green">066</FONT>        static public &lt;T&gt; List&lt;T&gt;<a name="line.66"></a>
<FONT color="green">067</FONT>        list() { return new List&lt;T&gt;(); }<a name="line.67"></a>
<FONT color="green">068</FONT>    <a name="line.68"></a>
<FONT color="green">069</FONT>        // java.lang.Iterable interface<a name="line.69"></a>
<FONT color="green">070</FONT>    <a name="line.70"></a>
<FONT color="green">071</FONT>        /**<a name="line.71"></a>
<FONT color="green">072</FONT>         * Iterates over the values in this list.<a name="line.72"></a>
<FONT color="green">073</FONT>         * @return forward iterator over this list<a name="line.73"></a>
<FONT color="green">074</FONT>         */<a name="line.74"></a>
<FONT color="green">075</FONT>        public final Iterator&lt;T&gt;<a name="line.75"></a>
<FONT color="green">076</FONT>        iterator() { return new IteratorX(); }<a name="line.76"></a>
<FONT color="green">077</FONT>    <a name="line.77"></a>
<FONT color="green">078</FONT>        protected final class<a name="line.78"></a>
<FONT color="green">079</FONT>        IteratorX implements Iterator&lt;T&gt;, Serializable {<a name="line.79"></a>
<FONT color="green">080</FONT>            static private final long serialVersionUID = 1L;<a name="line.80"></a>
<FONT color="green">081</FONT>    <a name="line.81"></a>
<FONT color="green">082</FONT>            private Link&lt;T&gt; current = near(first);<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>            public boolean<a name="line.84"></a>
<FONT color="green">085</FONT>            hasNext() { return current != last; }<a name="line.85"></a>
<FONT color="green">086</FONT>    <a name="line.86"></a>
<FONT color="green">087</FONT>            public T<a name="line.87"></a>
<FONT color="green">088</FONT>            next() {<a name="line.88"></a>
<FONT color="green">089</FONT>                if (current == last) { throw new NoSuchElementException(); }<a name="line.89"></a>
<FONT color="green">090</FONT>                final T r = current.value;<a name="line.90"></a>
<FONT color="green">091</FONT>                current = near(current.next);<a name="line.91"></a>
<FONT color="green">092</FONT>                return r;<a name="line.92"></a>
<FONT color="green">093</FONT>            }<a name="line.93"></a>
<FONT color="green">094</FONT>    <a name="line.94"></a>
<FONT color="green">095</FONT>            public void<a name="line.95"></a>
<FONT color="green">096</FONT>            remove() { throw new UnsupportedOperationException(); }<a name="line.96"></a>
<FONT color="green">097</FONT>        }<a name="line.97"></a>
<FONT color="green">098</FONT>    <a name="line.98"></a>
<FONT color="green">099</FONT>        // org.ref_send.list.List interface<a name="line.99"></a>
<FONT color="green">100</FONT>    <a name="line.100"></a>
<FONT color="green">101</FONT>        /**<a name="line.101"></a>
<FONT color="green">102</FONT>         * Is the element count zero?<a name="line.102"></a>
<FONT color="green">103</FONT>         */<a name="line.103"></a>
<FONT color="green">104</FONT>        public boolean<a name="line.104"></a>
<FONT color="green">105</FONT>        isEmpty() { return 0 == size; }<a name="line.105"></a>
<FONT color="green">106</FONT>    <a name="line.106"></a>
<FONT color="green">107</FONT>        /**<a name="line.107"></a>
<FONT color="green">108</FONT>         * Gets the element count.<a name="line.108"></a>
<FONT color="green">109</FONT>         */<a name="line.109"></a>
<FONT color="green">110</FONT>        public long<a name="line.110"></a>
<FONT color="green">111</FONT>        getSize() { return size; }<a name="line.111"></a>
<FONT color="green">112</FONT>    <a name="line.112"></a>
<FONT color="green">113</FONT>        /**<a name="line.113"></a>
<FONT color="green">114</FONT>         * Gets the front value.<a name="line.114"></a>
<FONT color="green">115</FONT>         * @return front value<a name="line.115"></a>
<FONT color="green">116</FONT>         * @throws NullPointerException list is empty<a name="line.116"></a>
<FONT color="green">117</FONT>         */<a name="line.117"></a>
<FONT color="green">118</FONT>        public T<a name="line.118"></a>
<FONT color="green">119</FONT>        getFront() throws NullPointerException {<a name="line.119"></a>
<FONT color="green">120</FONT>            if (0 == size) { throw new NullPointerException(); }<a name="line.120"></a>
<FONT color="green">121</FONT>            return near(first).value;<a name="line.121"></a>
<FONT color="green">122</FONT>        }<a name="line.122"></a>
<FONT color="green">123</FONT>    <a name="line.123"></a>
<FONT color="green">124</FONT>        /**<a name="line.124"></a>
<FONT color="green">125</FONT>         * Removes the front element.<a name="line.125"></a>
<FONT color="green">126</FONT>         * @return removed value<a name="line.126"></a>
<FONT color="green">127</FONT>         * @throws NullPointerException list is empty<a name="line.127"></a>
<FONT color="green">128</FONT>         */<a name="line.128"></a>
<FONT color="green">129</FONT>        public T<a name="line.129"></a>
<FONT color="green">130</FONT>        pop() throws NullPointerException {<a name="line.130"></a>
<FONT color="green">131</FONT>            if (0 == size) { throw new NullPointerException(); }<a name="line.131"></a>
<FONT color="green">132</FONT>            final Link&lt;T&gt; x = near(first);<a name="line.132"></a>
<FONT color="green">133</FONT>            final T r = x.value;<a name="line.133"></a>
<FONT color="green">134</FONT>            x.value = null;<a name="line.134"></a>
<FONT color="green">135</FONT>            first = x.next;<a name="line.135"></a>
<FONT color="green">136</FONT>            size -= 1;<a name="line.136"></a>
<FONT color="green">137</FONT>            return r;<a name="line.137"></a>
<FONT color="green">138</FONT>        }<a name="line.138"></a>
<FONT color="green">139</FONT>    <a name="line.139"></a>
<FONT color="green">140</FONT>        /**<a name="line.140"></a>
<FONT color="green">141</FONT>         * Appends a value.<a name="line.141"></a>
<FONT color="green">142</FONT>         * @param value value to append<a name="line.142"></a>
<FONT color="green">143</FONT>         */<a name="line.143"></a>
<FONT color="green">144</FONT>        public void<a name="line.144"></a>
<FONT color="green">145</FONT>        append(final T value) {<a name="line.145"></a>
<FONT color="green">146</FONT>            last.value = value;<a name="line.146"></a>
<FONT color="green">147</FONT>            size += 1;<a name="line.147"></a>
<FONT color="green">148</FONT>            if (capacity == size) {<a name="line.148"></a>
<FONT color="green">149</FONT>                final Link&lt;T&gt; spare = new Link&lt;T&gt;();<a name="line.149"></a>
<FONT color="green">150</FONT>                spare.next = last.next;<a name="line.150"></a>
<FONT color="green">151</FONT>                last.next = ref(spare);<a name="line.151"></a>
<FONT color="green">152</FONT>                capacity += 1;<a name="line.152"></a>
<FONT color="green">153</FONT>            }<a name="line.153"></a>
<FONT color="green">154</FONT>            last = near(last.next);<a name="line.154"></a>
<FONT color="green">155</FONT>        }<a name="line.155"></a>
<FONT color="green">156</FONT>        <a name="line.156"></a>
<FONT color="green">157</FONT>        /**<a name="line.157"></a>
<FONT color="green">158</FONT>         * Constructs an {@linkplain #append append}er.<a name="line.158"></a>
<FONT color="green">159</FONT>         */<a name="line.159"></a>
<FONT color="green">160</FONT>        public Receiver&lt;T&gt;<a name="line.160"></a>
<FONT color="green">161</FONT>        appender() { return new Appender(); }<a name="line.161"></a>
<FONT color="green">162</FONT>    <a name="line.162"></a>
<FONT color="green">163</FONT>        protected final class<a name="line.163"></a>
<FONT color="green">164</FONT>        Appender extends Struct implements Receiver&lt;T&gt;, Serializable {<a name="line.164"></a>
<FONT color="green">165</FONT>            static private final long serialVersionUID = 1L;<a name="line.165"></a>
<FONT color="green">166</FONT>    <a name="line.166"></a>
<FONT color="green">167</FONT>            public void<a name="line.167"></a>
<FONT color="green">168</FONT>            apply(final T value) { append(value); }<a name="line.168"></a>
<FONT color="green">169</FONT>        }<a name="line.169"></a>
<FONT color="green">170</FONT>    }<a name="line.170"></a>




























































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